[JENA-1586] Fuseki does not close files of dataset when the dataset is removed

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: Jena 3.6.0
• Fix Version/s: Jena 3.9.0
• Component/s: Fuseki

Environment

Debian 9.5 with Jena 3.6.0

• Assignee: Andy Seaborne
• Reporter: Tom den Braber
• Created: 06/Aug/18 06:47
• Updated: 08/Oct/18 20:29
• Resolved: 12/Aug/18 10:03

Description

When you remove a TDB-dataset over HTTP from the Fuseki server, Fuseki does not close the file. 

Steps to reproduce:

First: create a dataset over HTTP with name 'x'. Then, delete the dataset with name 'x'. Now inspect the open files of the fuseki process by running lsof -p <FUSEKI_PROCESS_ID> you see that a dataset with name 'x' is  still opened by the Fuseki-process.

Impact:

When a Fuseki process runs for a long time, and many datasets are created and deleted, it will in the end lead to a situation in which you cannot create new datasets anymore. Each attempt to creating a dataset will lead to a HTTP response code 500 with message 'java.nio.file.FileSystemException: /var/lib/fuseki/templates/config-tdb: Too many open files'. Also, keeping the files open leads (I suspect) to a higher memory usage than strictly needed.

Issue Links

• is related to: JENA-1481 Deleting dataset in Fuseki does not delete dataset permanently